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BQ25010: Possible to charge 3.7v parallel connected 18650 Li-ion battery pack with BQ25010?

David__
Genius 3585 points
Part Number: BQ25010

Hi, I used BQ25010RHLR in the past for my custom PCB.

Now, I'm using a Li-ion battery pack that is parallelly connected 

and micro USB will be used to charge this battery.

This is the battery pack I'm using; take a look at the link. (summary: 3.7~4.2V, 18650 type, 4000mAh).

I'm going to use one packed battery per PCB. In the BQ25010's datasheet, it says

The integrated low-power high-efficiency dc-dc converter is designed to operate directly from a single-cell Li-Ion or Li-Pol battery pack

1. I don't know much about batteries. Is the aforementioned packed battery considered as a single-cell battery?

2. If I cannot use BQ25010 with this packed battery for USB charging, is there an alternative charging IC from TI I can use?

It will be great if that IC has a buck converter like the BQ25010 and capable of micro USB charging.

  • 0
    TI__Guru* 75846 points
    Hi David
    The one pack with two batteries in parallel can be treated as a single-cell battery. Charging requirements will be very similar. Details on the charging requirements should be provided by the manufacture.
    Voltage will be the same 4.2V ( is typical ), termination current may be higher due to two cells in parallel.
    The pack capacity (mAhr) is higher and it may take the bq25010 longer to charge this pack at 500mA. This will depend on your requirements, how long to complete charge.
    But from a high level view, yes the bq25010 can be used to charge the pack.
  • 0 in reply to Bill Johns
    Genius 3585 points
    Hi, Bill. Thanks for your reply. Before closing this, I wish to ask a few more.

    - Compared to the picture, I received a pack with 4 batteries in parallel. The total capacity is 10600mAh.

    Regardless of the number of batteries in parallel, this can be treated as a single-cell battery, right?

    -Thanks for reminding me that it will take long to charge due to the high pack capacity.

    However, my requirement was to use the micro USB charging. As far as I know, micro USB supports 500mA charging rate, max.

    Do you mean if I choose another BQ IC from TI, I can charge faster than 500mA even if the system uses the micro USB?

    After double checking these, I will close this question.
  • 0 in reply to David__
    TI__Guru* 75846 points
    Hi David
    "Regardless of the number of batteries in parallel, this can be treated as a single-cell battery, right?"--Bill J - Yes
    Note the battery in a parallel pack will be matched by the manufacture to work in a parallel configuration, this should only be done by the cell manufacture.

    "Do you mean if I choose another BQ IC from TI, I can charge faster than 500mA even if the system uses the micro USB?"--Bill J--If your input current is limited to 500mA your options are limited. We have higher current charger that would support a 10600mAh cell but you will need more input current.